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Power system security in market clearing and dispatch mechanisms

Power system security in market clearing and dispatch mechanisms,10.1109/PES.2006.1709534,Claudio A. Canizares,Sameh K. M. Kodsi

Power system security in market clearing and dispatch mechanisms   (Citations: 4)
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This paper presents and discusses some typical market clearing and dispatch mechanisms based on security-constrained (SC) optimal power flow (OPF) techniques that are currently being utilized in various jurisdictions throughout the world, concentrating on how system security is accounted for in these auction systems and the effect that this has on the system dispatch schedules and energy prices. The Ontario market is used as an example to illustrate the practical application of these security-constrained clearing and dispatch mechanisms. The need for a better representation of system security in the existent auction systems is also discussed, based on the fact that "unexpected" dispatch solutions, resulting from diverse bidding patterns and the mechanisms used to clear and dispatch the market, may render ineffective the predetermined system security limits typically used in most auction models, leading to insecure operating conditions and/or unnecessary high prices associated with an unrealistic modeling of system congestion. The latter is illustrated using a simple 6 bus test system, comparing the dispatch levels and prices, as well as the general system operating conditions, obtained from a SC-OPF auction mechanism with respect to those obtained using a voltage-stability-constrained technique, which better represents system security
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    • ...The problem with these limits is that they do not always represent the actual security limits directly associated with the current market and system conditions, given the variability of dispatch due to economic drivers, resulting in some cases in insecure operating conditions and/or inappropriate price signals [3], [4]...
    • ...The following is a typical SC-OPF auction model, which includes the ac power flow equations as part of the optimization auction constraints to directly account for reactive power and voltage control and their associated limits [3]:...
    • ...It is important to highlight the fact that these security limits do not correspond to the actual system conditions associated with the resulting solutions, since these limits were not necessarily obtained using the operating conditions corresponding to the solution of the OPF-based auction; hence, this model may yield insecure operating conditions and/or inappropriate price signals [3], [4]...

    Victor J. Gutierrez-Martinezet al. Neural-Network Security-Boundary Constrained Optimal Power Flow

    • ...According to [7], the power dispatch problem is solved by several methods maximizing the general utility subject to a set of power-flow constraints of the system...

    Andrés Pantojaet al. A Population Dynamics Approach for the Dispatch of Distributed Generat...

    • ...Typically, active power dispatch is carried out based on a Linear Programming (LP) model associated with an Economical Load Dispatch (ELD) problem that maximizes social welfare, while guaranteeing that system security constraints are met [21]...
    • ...Most ISOs throughout the world use DC-based OPF auction models for active power market clearing and dispatch, with iterative mechanisms to guarantee system security [21]...

    I. El-Samahyet al. An Optimal Reactive Power Dispatch Model for Deregulated Electricity M...

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